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Analog Devices Inc. LTC7840EFE#TRPBF
- Part No.:
- LTC7840EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC7840EFE#TRPBF.pdf
- Description:
- DUAL PHASE/OUTPUT NON-SYNCH BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:2,890
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Product details
Overview
LTC7840EFE#TRPBF from Analog Devices is a dual-phase, dual-output nonsynchronous boost controller driving external N-channel MOSFETs in high-voltage DC-DC conversion. It operates from 5.5V to 60V input, delivers programmable 50kHz–425kHz switching frequency, features ±1% 1.2V internal reference, dual RUN/PGOOD pins, and hiccup-mode overcurrent protection - deployed in industrial 240V boost supplies and telecom power shelves.
For engineers reviewing the LTC7840EFE#TRPBF datasheet, LTC7840EFE#TRPBF pinout, LTC7840EFE#TRPBF application, or LTC7840EFE#TRPBF equivalent, key selection criteria include its 28-pin TSSOP (FE28) package with exposed SGND pad, dual independent current-mode control loops, adjustable max duty cycle (75–96%), 10µA ILIM pin current for precise current limit programming, and integrated 10V/3.8V cascaded LDOs powering gate drivers and analog circuitry.
Technical Context
The LTC7840EFE#TRPBF implements constant-frequency peak current-mode control with smooth quadratic slope compensation and dynamic slope recovery per channel. Its two 180° out-of-phase channels support independent soft-start (10µA SS charge current), phase-lockable synchronization (50–450kHz), and configurable topologies including boost, SEPIC, and flyback.
Internal architecture includes cascaded LDOs: a 10V DRVCC regulator (4.4V UVLO rising) powers gate drivers, while a 3.8V INTVCC regulator (3.3V UVLO rising) supplies control circuitry. Fault management integrates hiccup-mode protection triggered by ITH voltage thresholds and blanking-time-adjustable minimum on-time (120–200ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5.5V to 60V - accommodates automotive load dump surges and industrial wide-input systems without external pre-regulation. |
| Switching Frequency | 50kHz to 425kHz - programmable via FREQ pin (10µA sink) or synchronized externally; enables EMI optimization and magnetics size reduction. |
| Feedback Reference | 1.2V ±1% - high-accuracy reference enabling stable output regulation across temperature and line/load variations. |
| Max Duty Cycle | 75% to 96% - set by DMAX pin voltage (SGND/float/INTVCC), directly controlling maximum achievable output voltage in boost topology. |
| Current Sense Threshold | 75mV typical (ILIM pin floating) - precise current limit setting with ±5% channel mismatch, critical for MOSFET stress management. |
| Gate Drive Voltage | 10V DRVCC output - sufficient to fully enhance high-voltage N-channel MOSFETs (e.g., RDS(ON) rated at VGS = 6V–10V). |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments with thermal derating guidance. |
Pinout & Package
The LTC7840EFE#TRPBF is housed in a 28-lead thermally enhanced TSSOP package (FE28) with exposed SGND pad (Pin 29), requiring soldering to PCB for thermal and electrical integrity. θJA = 30°C/W enables robust thermal performance in high-power boost applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RUN1 / RUN2 (Pins 9, 10) | Channel enable inputs | 1.22V threshold with 80mV hysteresis; internal 1µA/5.5µA pull-up enables reliable startup sequencing and fault shutdown. |
| VFB1 / VFB2 (Pins 7, 12) | Error amplifier feedback inputs | Connect to resistor dividers for independent output voltage regulation; ±5nA bias current minimizes divider error. |
| ITH1 / ITH2 (Pins 8, 13) | Current control threshold & compensation nodes | Set peak inductor current per channel; serve as EA output for loop compensation (RC/CC networks). |
| GATE1 / GATE2 (Pins 21, 19) | N-channel MOSFET gate drivers | 10V push-pull outputs referenced to PGND; 2Ω pull-up / 1Ω pull-down RDS(ON) supports fast switching of high-Qg MOSFETs. |
| SENSE1+/– / SENSE2+/– (Pins 28,27 / 14,15) | Differential current sense inputs | Measure MOSFET source current via external shunt; reject common-mode noise up to INTVCC. |
| ILIM1 / ILIM2 (Pins 26, 16) | Current limit programming pins | 10µA precision current sink - sets VSENSE(MAX) from 0mV to 75mV via resistor-to-SGND, enabling fine-grained OCP tuning. |
| DMAX (Pin 4) | Maximum duty cycle control | Configures 75% (INTVCC), 84% (float), or 96% (SGND) max on-time - critical for preventing transformer saturation or diode overstress. |
| BLANK (Pin 1) | Minimum on-time adjustment | Selects 120ns (SGND), 160ns (float), or 200ns (INTVCC) blanking - prevents false current-sense triggering during gate drive transitions. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current-mode control | Enables precise per-channel current limiting and load balancing in parallel or split-output configurations. |
| Programmable hiccup-mode overcurrent protection | Auto-recovery fault response using SS1/SS2 capacitor timing - avoids latch-off in transient overload conditions. |
| Flexible topology support (boost/SEPIC/flyback) | Single IC adapts to multiple isolated and non-isolated topologies via external component reconfiguration - reduces BOM count. |
| Integrated cascaded LDOs (10V/3.8V) | Eliminates need for external bias rails; DRVCC powers gate drivers, INTVCC powers analog/digital core - simplifies system power tree. |
| Phase-lockable synchronization (50–450kHz) | Enables multi-phase interleaving with external clock or CLKOUT daisy-chaining - reduces input/output ripple and EMI peaks. |
Applications
| Industrial High-Voltage Boost | Telecom Power Shelf |
|---|---|
|
Use Scenario: Generating 240V DC from 12V battery bus in factory automation PLCs with surge immunity. IC Role / Device Role / Timing Role: Dual-phase nonsynchronous boost controller managing two 120V stages in series, with independent current sensing and hiccup recovery. Use Value: 92% efficiency at 0.7A output (VIN=12V) and 60V input surge tolerance eliminate need for upstream pre-regulator. |
Use Scenario: 48V-to-36V/24V dual-output power shelf supplying base station RF amplifiers and control logic. IC Role / Device Role / Timing Role: Configured as dual-output controller with 180° phase shift, minimizing input capacitor RMS current and thermal stress. Use Value: Independent RUN/PGOOD pins enable hot-swap sequencing and fault isolation between RF and digital subsystems. |
| Automotive LED Driver Supply | Test Equipment HV Bias |
|
Use Scenario: Driving high-brightness LED arrays in commercial vehicle lighting with dimming and short-circuit protection. IC Role / Device Role / Timing Role: Single-output dual-phase boost delivering 48V @ 2A; BLANK and DMAX pins tuned for low-light stability and overvoltage clamp. Use Value: Adjustable min-on-time (120–200ns) prevents sub-harmonic oscillation at light loads, ensuring flicker-free dimming down to 1%. |
Use Scenario: Programmable HV bias supply in semiconductor ATE systems requiring rapid voltage ramping and precise current limiting. IC Role / Device Role / Timing Role: SEPIC-configured controller with soft-start current ramping (10µA SS charge) and ±10% PGOOD window for test pass/fail validation. Use Value: 1.2V ±1% reference and 5% channel current mismatch ensure <±0.5% output accuracy across 100ms voltage sweeps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC7841EFE#TRPBF | Includes synchronous rectification capability and integrated MOSFET drivers optimized for lower VOUT (<60V); lacks hiccup mode. | Better suited for medium-voltage, high-efficiency applications where conduction loss dominates; not recommended for >100V outputs. | Select LTC7841EFE#TRPBF only when synchronous operation and <60V output are required; LTC7840EFE#TRPBF remains optimal for >100V nonsynchronous designs. |
| LM5122MMX/NOPB | Single-channel, 65V max input, no dual-phase interleaving; uses external oscillator sync but no CLKOUT daisy-chain. | Requires two ICs for dual-output operation; lacks independent ILIM/SS per channel and phase-shift control. | Use LM5122MMX/NOPB for cost-sensitive single-output systems below 65V; LTC7840EFE#TRPBF provides integrated dual-channel control and thermal advantage in high-voltage stacks. |
Compared with LTC7841EFE#TRPBF and LM5122MMX/NOPB, the LTC7840EFE#TRPBF uniquely combines 60V input rating, dual-phase 180° interleaving, hiccup-mode protection, and flexible topology support - making it the only option qualified for industrial 240V boost with single-IC reliability and thermal margin.
Availability
LTC7840EFE#TRPBF is available at Aetrix Electronics and suitable for industrial high-voltage boost converters, telecom power shelves, and automotive LED driver supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC7840EFE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7840EFE#TRPBF belongs to Analog Devices' Power by Linear™ controller family, engineered for high-input-voltage, high-reliability DC-DC conversion in harsh environments where surge immunity, thermal robustness, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for the LTC7840EFE#TRPBF?
The LTC7840EFE#TRPBF supports an absolute maximum input voltage of 65V, with guaranteed operation across 5.5V to 60V. This wide range accommodates automotive load-dump transients and industrial brown-out conditions without external clamping, making the LTC7840EFE#TRPBF suitable for 48V and 60V bus systems.
Does the LTC7840EFE#TRPBF support synchronous rectification?
No, the LTC7840EFE#TRPBF is a nonsynchronous boost controller designed to drive external N-channel MOSFETs with external catch diodes. It does not integrate synchronous rectifier drivers or control logic - this architecture prioritizes simplicity and high-voltage capability over conduction loss reduction.
How is output voltage regulated on the LTC7840EFE#TRPBF?
Output voltage regulation on the LTC7840EFE#TRPBF is achieved through two independent error amplifiers. Each compares feedback from VFB1/VFB2 (connected to resistor dividers) against the internal 1.2V ±1% reference, generating ITH1/ITH2 control voltages that adjust peak inductor current per channel to maintain regulation.
What package type is used for the LTC7840EFE#TRPBF?
The LTC7840EFE#TRPBF uses a 28-lead thermally enhanced TSSOP package (FE28) with exposed SGND pad (Pin 29). This package delivers θJA = 30°C/W and requires soldering the exposed pad to PCB ground plane for optimal thermal performance and signal integrity.
Can the LTC7840EFE#TRPBF be configured for SEPIC or flyback topologies?
Yes, the LTC7840EFE#TRPBF is explicitly designed for topology flexibility: it supports boost, SEPIC, and flyback configurations via external component reconnection. The datasheet provides validated schematics and layout guidelines for all three, leveraging the same dual-channel current-mode architecture and gate drive capability.
LTC7840EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 5.5V ~ 60V
- Frequency - Switching:
- 50kHz ~ 425kHz
- Duty Cycle (Max):
- 96%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Current Limit, Enable, Frequency Control, Power Good
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LTC7840EFE#TRPBF FAQ
1.How can I place an order for LTC7840EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7840EFE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC7840EFE#TRPBF reliable?
The price and inventory of LTC7840EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7840EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7840EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7840EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7840EFE#TRPBF?
LTC7840EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7840EFE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC7840EFE#TRPBF?
For technical support, including LTC7840EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7840EFE#TRPBF requirements.
6.How does Aetrix verify that LTC7840EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7840EFE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC7840EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7840EFE#TRPBF?
All LTC7840EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7840EFE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC7840EFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7840EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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